The faceplate of a golf club head includes bars can be individually deflected, without permanent damage, in a direction perpendicular to the impact face when the impact face strikes a golf ball. Each of the bars has a frontwall which extends across the faceplate. When the frontwalls provide the impact face, they can be composed of the same material. Adjacent bars can have sidewalls which are in contact with each other or which are spaced apart from each other.
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20. A method of making a golf club head which comprises
(A) providing a club head body; and
(B) forming an impact face on the club head body, the impact face comprising, after step (B), a plurality of bars each of which
(a) has a frontwall. a rearwall and two sidewalls, the frontwall being exposed on the impact face, and the rearwall being exposed on the rear surface of the club head,
(b) can be individually deflected, without permanent damage, in a direction perpendicular to the impact face when the impact face strikes a golf ball, and
(c) consists of a metal.
1. A golf club head comprising
(1) a club head body, and
(2) a faceplate which
(i) provides an impact face and
(ii) comprises a plurality of bars each of which
(a) has a frontwall, a rearwall and two sidewalls, the frontwall having a length which extends across the faceplate and is the largest dimension of the bar,
(b) can be individually deflected, without permanent damage, in a direction perpendicular to the impact face when the impact face strikes a golf ball, and
(c) comprises a metal;
there being a void behind at least part of at least some of the bars.
16. A golf club head comprising
(1) a club head body, and
(2) a faceplate which
(i) provides an impact face and
(ii) comprises a plurality of bars each of which
(a) has a frontwall, a rearwall and two sidewalls, the frontwall having a length which extends across the faceplate and is the largest dimension of the bar,
(b) can be individually deflected, without permanent damage, in a direction perpendicular to the impact face when the impact face strikes a golf ball, and
(c) comprises a metal;
wherein there is a void behind at least part of at least some of the bars; the frontwalls of at least some of the bars are exposed on the impact face; and the frontwalls of all of the bars exposed on the impact face are composed of the same material.
2. A golf club head according to
3. A golf club head according to
4. A golf club head according to
5. A golf club head according to
6. A golf club head according to
7. A golf club head according to
8. A golf club head according to
9. A golf club head according to
10. A golf club head according to
11. A golf club head according to
12. A golf club head according to
13. A golf club head according to
14. A golf club head according to
15. A golf club head according to
17. A golf club head according to
18. A golf club head according to
19. A golf club head according to
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This application is a continuation application of application Ser. No. 11/261,915, filed Oct. 31, 2005, now U.S. Pat. No. 7,364,513. Application Ser. No. 11/261,915 is a continuation application of application Ser. No. 10/616,984, filed on Jul. 11, 2003, now abandoned. The entire disclosure of that patent and each of those applications is incorporated herein by reference.
This invention relates to golf club heads for golf clubs such as drivers, irons and putters.
Many proposals have been made to design golf clubs which provide improved control over, and feel for, the golf ball, for example by providing grooves on the impact face of the golf club head. Reference may be made, for example, to U.S. Pat. Nos. 1,383,654, 1,452,695, 1,494,494, 5,176,384, 5,358,249, 5,405,136, 5,542,675, 5,766,093, 5,807,190 and 6,007,435. The disclosure of each of those patents is incorporated herein by reference for all purposes. Not all of the proposals comply with the USGA Rules of Golf, Rule 4 and Appendix II, which require that, for clubs other than putters, “the whole of the impact area” of the club face “must be of the same material” and that impact area markings, such as grooves, should comply with certain requirements. The “impact area” of a club head is referred to herein as the “impact face”.
In a first preferred aspect, this invention provides golf club head comprising
In a second preferred aspect, this invention provides a method of making a golf club head, for example a golf club head according to the first preferred. aspect of the invention, the method comprising
The composition, dimensions and arrangement of the bars are preferably chosen so that the impact face has a desired response when a golf ball impacts it at different positions across the insert. In some embodiments, the sidewalls of the bars are pre-shaped so that adjacent sidewalls provide grooves of desired dimensions on the impact face. For example, half grooves are machined onto the appropriate sidewalls so that, when the bars are incorporated into the faceplate, the adjacent half grooves form grooves on the impact face. This allows individual bars to be economically mass produced before being incorporated into an inset in the face of a club head. In some embodiments, the bars are retained in the recess by a dovetail geometry on the ends of the bars. In a preferred embodiment, a top and/or bottom retainer element is pressed into place in the dovetail in order to lock the bars into position.
Preferred club heads of the invention can provide important advantages by comparison with conventional golf clubs in which the impact face is provided by a single piece of material (and, therefore, has a “trampoline” geometry with a centroidal sweet spot outside of which performance drops off quickly). Such advantages can include:
Preferred club heads of the invention, particularly club heads for irons and drivers, conform with the USGA Rules of Golf with respect to grooves on, and uniformity of material of, the impact face.
Preferred embodiments of the method of the invention provide an improved method of manufacturing a club head having grooves in its impact face.
Referring for example to
The side edges 6 of the bars' frontwalls 13 may be machined before assembly such that a groove 10,26 is formed between adjacent bars and/or between the bars and any retainers 7, 9, 27,29,34,35,44,47. A bar 37,48 side edge may be machined to provide a full length groove between adjacent bars. Alternatively, the bars 38,49 may be machined to provide a less than full length groove between adjacent bars. The bars may also be machined to form grooves in the frontwalls between the edges. The groves may be any shape (e.g., V shaped, square, or round); although, the V shaped grooves formed by two adjacent beveled edges are preferred. This allows for the economical production of precision machined grooves on a golf club face.
The bars may be retained in position in a club head by an interlocking arrangement, by bonding such as metallurgical or adhesive bonding or a combination thereof. For example, the bars may be retained in the club face by mating edges 5 forming a dovetail or other suitable geometry cast or machined into the recess 2 in the club head, e.g., spaced apart vertically or horizontally extending mating surfaces at opposed edges of the recess. In a preferred embodiment, the assembly of a “bars” iron is as illustrated in
As illustrated in
A further feature of the “bars” approach to providing an insert for a golf club having an impact face is that the bars can be of any desirable material. For example, in putters it is desirable to achieve a soft feel so a polymeric material with a low modulus of elasticity may be selected for the bars. In an iron type club a highly elastic material with a non-linear modulus like NiTi may be selected for its ability to absorb and recover from high energy impacts. In a wood type club, materials of the highest hardness may be used to maximize flight distance.
The mechanical properties of the impact face may be influenced by varying the length, width, and arrangement of the bars. The bars may be rectilinear (i.e. straight) as in
As illustrated in
As illustrated in
As illustrated in
As illustrated in
As illustrated in
The invention can be implemented in variations of the foregoing embodiments. For example, the length and direction of the bars could be varied as well within a single club face and/or a configuration of variously treated short bars could be bonded to backing bars and/or provided with mating surfaces in adjacent endwalls. Further, bars of uniform but differently processed (e.g. heat treated) material may used to provide a more even impact response across an impact face and/or smaller bars might be used to heighten this effect, e.g., short bars may be machined to provide mating surfaces at the end walls. Alternatively, short bars may have flat end walls and rely solely on adhesion to a backing bar for retention in the club head. The directions of bars may change one or more times across the impact face. In arrangements of this type, the adjacent endwalls and sidewalls of orthogonal bars may be shaped to provide mating surfaces to retain bars not in contact with the edges of the recess. Bars of mixed shape and orientation may be combined in various arrangements to provide desired properties such as differing groove and surface deflection directions as a function of the impact position on the impact face. Multiple layers of individual bars may be inserted in a club head recess, e.g., an outer layer of bars may be retained in the recess over a backing plate comprising an inner layer of backing bars to provide a fine tuned surface response. The exposed layer may be of a thin, uniform, and elastic material such as NiTi. Backing layers may be of any hardness, cross-section, and arrangement. In a preferred embodiment, the surface bars mate with edges of the recess for purposes of retention.
An advantage of preferred embodiments of the invention is the ability to provide a more uniform response to off-center hits. This can be accomplished with the “bars” approach by varying the thickness of the material of the bars over the impact face. Also, the mechanical properties may vary at different points in the impact face while presenting a uniform material surface. For example, bars heat-treated or otherwise processed in different ways either uniformly lengthwise or variably along a bar's length would allow the impact face to be fine tuned for its response characteristics. Multi-layer bars may incorporate several laminations of different materials specifically chosen for vibration dampening properties or elastic response or both. The various configurations of shape, orientation, and thickness of can be used to offset inherent imbalance and inertia effects in a club when hit off-center or to help compensate an inherently faulty swing. The back-face of the bars may comprise structural features such as a bump or island for the purpose of limiting the travel of a deflected bar upon impact with a ball.
Any of the previous examples might be used in conjunction. For example, alternating layers of vertical and horizontal bars might be used to fine tune the response of the impact face. Likewise, any other combination of the exemplary designs might be implemented varying the thickness, width, length, material, properties, and direction.
In addition to the forgoing description, the invention and preferred embodiments thereof may be further understood by consideration of the following examples.
Iron with enhanced off-center impact response.
Any of the long (i.e., irons numbered 1 to 5) type clubs may be enhanced for distance with consistency of control by providing an impact face with a larger area of uniform impact response. To this end, a club head body is provided with a recess in the form of a vertical dovetail slot in the face. A polished steel retainer, flat on top with the top front edge machined at a 45 degree angle to a depth of 0.02 inches, contoured on the bottom to match the bottom and sole of the club face, and machined into a dovetail wedge at each end, is press fit into the bottom of the dovetail slot. A series of 10 NiTi bars, about 0.13 inches wide, machined to a 10 degree angle at each end (with a 0.015 inch 45 degree chamfer at the wedge tip) are sized to fit snugly in the dovetail slot. The bars are about 0.1 inches deep at the ends of the frontwall. The side-edges of the front wall are machined at a 45 degree angle to a depth of 0.02 inches. The back side of each bar is machined in a parabolic contour lengthwise with the center of the 6th bar machined to approximately half its depth; upper bars are machined more deeply than lower bars in sequence stepwise such that a rear view of the bars stacked in order shows a smooth parabolic contour along the heel to toe direction of the bars and a step-wise linear progression from top to bottom of the stack. The bars are stacked tightly together in the slot forming a precision V shaped groove at each adjacent edge. A top retainer of polished steel, flat on the bottom with the bottom front edge machined at a 45 degree angle to a depth of 0.02 inches, contoured on the top to match the top of the club face, and machined into a wedge at each end to fit tightly in the dovetail slot, is press fit into the top of the dovetail slot. In an on-center impact, the shaped impact deflection focuses energy otherwise dispersed across the face to a center line of thrust. In the case of a slightly off-center impact the shaped deflection of the face re-focuses the flight of ball in the intended direction with minimal loss of distance. The top to bottom thickness progression smooths and expands the sweet spot vertically for high and low impacts. Balls struck at the bottom of the impact face are increasingly directed upward to the desired loft and balls struck near the top of the impact face have a softer feel and longer contact time with the impact face.
Irons with enhanced spin and directional control.
An iron type club is provided with an insert of pointing “V” shaped bars as illustrated in
The various illustrations demonstrate the potential to change properties across the club face while still conforming, if desired, with the one material constraint of the USGA rules. Numerous alternative arrangements, bar treatments, shapes, materials, and retaining arrangements may be imagined.
The foregoing has described the principles, preferred embodiments and mode of operation of the present invention. However, the invention should not be construed as being limited to the particular embodiments discussed. Thus the above-described embodiments should be regarded as illustrative rather than restrictive, and it should be appreciated that variations may be made in those embodiments by those skilled in the art without departing from the scope of the present invention as defined by the following claims.
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